IMO Level 1 Mathematics Olympiad (SOF) Class 10: Questions 552  557 of 968
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Question number: 552
Question
Dharma got married 5 years ago. Today her age is times her age at the time of marriage. Her son’s age is times her age. Her son’s age is ________
Choices
Choice (4)  Response  

a.  13 years 

b.  12 years 

c.  10 years 

d.  15 years 

Question number: 553
Question
One fourth of a head of cows is in the forest. Twice the square root of the head has gone to mountains, and of the remaining, 15 are on the bank of a river. The total number of cows is ________
Choices
Choice (4)  Response  

a.  6 

b.  63 

c.  36 

d.  100 

Question number: 554
Question
P is thrice good a workman as Q and therefore is able to finish a job in 40 days less than Q. Working together they can do it in ________ days.
Choices
Choice (4)  Response  

a.  16 

b.  15 

c.  14 

d.  10 

Question number: 555
Question
A girl calculates that the probability of her winning the first prize in a lottery is 0.15. If 8000 tickets are sold, how many tickets has she bought?
Choices
Choice (4)  Response  

a.  1400 

b.  1800 

c.  1200 

d.  1600 

Question number: 556
Question
A man whose bowling average is 12.4 takes 5 wickets for 26 runs and thereby decreases his average by 0.4. The number of wickets, taken by him, before his last match, is ________
Choices
Choice (4)  Response  

a.  72 

b.  85 

c.  64 

d.  78 

Question number: 557
Question
If compound interest on a certain sum for 2 years is Rs. 451 the simple interest will be ________
Choices
Choice (4)  Response  

a.  325 

b.  440 

c.  625 

d.  352 
